squatter stops when it encounters a locked mailbox?

[Per olof Ljungmark]

All,

While migrating a few accounts from Exchange to Cyrus ( has nothing to 
do with the below really) and staring at log files I noted the following

squatter[70553]: error locking index user/xyz: Mailbox is locked by POP 
server

and squatter bails out without indexing the remaining mailboxes. Is this 
expected behaviour in 2.3.16?

Thanks,